1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<LINK REL="STYLESHEET" HREF="VisualRef.css" CHARSET="ISO-8859-1" TYPE="text/css">
</head>
<body bgcolor="#FFFFFF">
<p class="Normal"><font color="#0000A0">Click example</font></p>
<div>
<p class="Normal"> This program displays a sphere (which automatically creates
a window referred to as <span class="attribute">scene</span>), then repeatedly
waits for a mouse left click, prints the mouse position, and displays a small
red sphere. A mouse left click is defined as pressing and releasing the left
mouse button at nearly the same location.</p>
</div>
<div>
<h2 class="program0"> scene.range = 4</h2>
<p class="program">sphere() # display a white sphere for context</p>
<p class="program"> while 1:</p>
<p class="program"> if scene.mouse.clicked:</p>
<p class="program"> m = scene.mouse.getclick()</p>
<p class="program"> loc = m.pos</p>
<p class="program"> print loc</p>
<p class="program"> sphere(pos=loc,
radius=0.1, color=(1,0,0))</p>
<p class="Normal"> Try running this program. You will find that if you click
inside the white sphere, nothing seems to happen. This is because the mouse
click is in the x,y plane, so the little red sphere is buried inside the large
white sphere. If you rotate the scene and then click, you'll see that the
little red spheres go into the new plane parallel to the screen and passing
through <span class="attribute">display.center</span>. If you want all the
red spheres to go into the xy plane, do this:</p>
</div>
<div>
<h2 class="program0"> loc =
m.project(normal=(0,0,1))</h2>
<p class="program"> if loc:
# loc is None if no intersection with plane</p>
<p class="program"> print
loc</p>
<p class="program"> sphere(pos=loc,
radius=0.1, color=(1,0,0))</p>
</div>
<p class="Normal">Choose Back, or <a href="mouse.html">Go to top of mouse documentation</a></p>
</body>
</html>
|
